flow test prints unreadable output

Start by running flow test with the failing deployment-order scenario shown in cadence/tests/yield_vaults_strategy_vault_test.cdc, then trace the reported location in helpers/deployment_helpers.cdc:52. The work is done when test failures no longer emit the escaped internal Cadence wrapper, excessive padding, and unreadable raw error output.

Summary

When a Cadence test deploys contracts in the wrong dependency order or similar issues, flow test prints hundreds of lines of raw, unformatted output that is nearly impossible to read and lags the terminal.

Current Behavior

The CLI outputs the full internal Cadence representation of the error, including the I.Test.Test.Error(message: "...") wrapper with all nested error chains encoded as an escaped string. Every line of the output is also padded with trailing spaces to a fixed column width. Example:

flow test
❌ Command Error: error in test file "cadence/tests/yield_vaults_strategy_vault_test.cdc": Execution failed:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
error: assertion failed: given value is: I.Test.Test.Error(message: "[Error Code: 1101] error caused by: 1 error occurred:\n\t* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:\nerror: cannot deploy invalid contract\n --> 69f412eecfa8b27d65c15b19943ed0d8a00b87d89ca7e7fabb309dc13b400084:5:20\n  |\n5 |                     signer.contracts.add(name: \"FlowYieldVaultsInterfaces\", code: \"696d706f72742046756e6769626c65546f6b656e2066726f6d203078303030303030303030303030303030320a696d706f727420466c6f77416374696f6e732066726f6d203078303030303030303030303030303030370a0a61636365737328616c6c2920636f6e747261637420466c6f775969656c645661756c7473496e7465726661636573207b0a0a2020202061636365737328616c6c292073747275637420696e74657266616365205374726174656779207b0a202020202020202061636365737328616c6c292066756e20637... \n  |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nerror: cannot find declaration `FlowActions` in `0000000000000007.FlowActions`\n --> 0000000000000007.FlowYieldVaultsInterfaces:2:7\n  |\n2 | import FlowActions from 0x0000000000000007\n  |        ^^^^^^^^^^^ available exported declarations are:\n\n\n  See documentation at: https://cadence-lang.org/docs/language/imports\n\nWas this error unhelpful?\nConsider suggesting an improvement here: https://github.com/onflow/cadence/issues.\n\n\n")
  --> helpers/deployment_helpers.cdc:52:4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
Was this error unhelpful?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
Consider suggesting an improvement here: https://github.com/onflow/cadence/issues.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

• thousands of whitespaces, which need text wrapping lagging the terminal
  The output frequently exceeds 200 lines for a single assertion failure.

Expected Behavior

The CLI should display only the actionable Cadence errors (compiler/checker errors, type errors, etc.) with their source locations, without the [Error Code: 1101] transaction wrapper, the cannot deploy invalid contract outer block, or the raw I.Test.Test.Error(message: "...") encoding. Example:

❌ Test Error: cadence/tests/yield_vaults_test.cdc
Assertion failed at: helpers/deployment_helpers.cdc:55:4

error: cannot find declaration `FlowYieldVaults` in `0000000000000007.FlowYieldVaults`
 --> 0000000000000007.FlowYieldVaultsAdmin:1:7

error: ambiguous intersection type
  --> 0000000000000007.FlowYieldVaultsAdmin:23:62

Steps to Reproduce

1. Write 2 contracts
2. A includes B
3. deploy A